SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '004e1901889a3c7abfecb401e6db976614087f781a8c011b66f267714b69537a' 
  AND token = 'gUYy6u5W4HlABZx9vQGN9/gp3wXhYSCvy9RJ3fb4qvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}